Worth it in what way, and compared to what?
I have a Spike kettle, like it a lot. Part of the reason is I don't care for weldless fittings. SSBrewtech's 15-gallon kettle has them. Spike does the welded fittings, and do it well. But SS Brewtech also includes a ball valve where it's extra with the Spike, and they have two pre-drilled holes which you may use later to add a thermometer, recirculation port whatever.
But that said, Spike's ports are 1/2" ID, which means for fast movement of water and wort; SSBrewtech's are, from what I can tell on their site, perhaps 3/8".
If money is dear, the SSBrewtech is a better buy; if heavy-dutiest is your goal, then IMO the Spike is a better offering, but it's going to cost you more as you'll need to buy things like a valve, dip tube, and perhaps other things.
You can brew good beer with both.